Tawny Ports are of two distinct types. The younger is usually called a "Fine Tawny". The other is called Aged Tawny. Those ports age for longer periods in oak casks, mainly for 10, 20, 30 and 40 years. Those are rich and mellow tawny ports whose delicious nuttiness and aromas of butterscotch and fine oak wood intensify the longer they spend in wood.